Hi @Rishabh, tags are pretty useful for the navigational purpose. Let me give you an example, and you can take this forum itself for that…

We have a category for SEO, that is typical right, but I can’t exactly have a category for Yoast SEO plugin, like, it’s a popular topic but yet, I don’t really want to assign a category for this. So, we created Yoast SEO tag for this.

This way, I can use this tag on our posts, so that our members can easily check all the topics written about Yoast SEO easily.